SNCF Class X 52100

21.2 metres (69 ft 6+3⁄4 in) over buffersMaximum speed110 km/h (68 mph)Weight41 tonnes (40 long tons; 45 short tons)Prime mover(s)two 320 hp Saurer BZDSe powering two 1450 W auxiliary generatorsEngine typeDieselTraction motorsfour Oerlikon electric motorsPower output640 hpTrack gauge1,435 mm (4 ft 8+1⁄2 in)

The SNCF X 52100 class are diesel railcars that operated on the alpine lines from Grenoble, France from 1945 until 1973. ^[1] They were capable of multiple unit operation with other car types, requiring an operator in each car; the lead conductor giving acceleration or deceleration orders using an audible tone. ^[1]

These were the first diesel-electric railcars used by the SNCF ^[2]

The X 52100 units were used on the mountain lines out of Grenoble.

Only one example of the class remains :

• X 52103: Cité du Train, in operating condition. Saved by the SNCF, it was restored by the Oullins-Voitures workshop in 1976 and donated to Cité du Train in 1988. ^[1]